Merge pull request #228 from k3s-io/default_k3s_script
Fix HA, simplify provisioning, add Vagrant test cluster
This commit is contained in:
commit
2e1da471c9
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@ -0,0 +1,5 @@
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---
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warn_list:
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- var-naming[no-role-prefix]
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- yaml[comments-indentation]
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- yaml[line-length]
|
17
README.md
17
README.md
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@ -22,7 +22,7 @@ on processor architecture:
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## System requirements
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Deployment environment must have Ansible 2.4.0+
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Master and nodes must have passwordless SSH access
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Server and agent nodes must have passwordless SSH access
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## Usage
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@ -48,7 +48,7 @@ k3s_cluster:
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If needed, you can also edit `vars` section at the bottom to match your environment.
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If multiple hosts are in the server group the playbook will automatically setup k3s in HA mode with embedded etcd.
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An odd number of server nodes is recommended (3,5,7). Read the offical documentation below for more information and options.
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An odd number of server nodes is required (3,5,7). Read the offical documentation below for more information and options.
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https://rancher.com/docs/k3s/latest/en/installation/ha-embedded/
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Using a loadbalancer or VIP as the API endpoint is preferred but not covered here.
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@ -61,8 +61,19 @@ ansible-playbook playbook/site.yml -i inventory.yml
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## Kubeconfig
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To confirm access to your **Kubernetes** cluster use the following:
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After successful bringup, the kubeconfig of the cluster is copied to the control-node and set as default (`~/.kube/config`).
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Assuming you have [kubectl](https://kubernetes.io/docs/tasks/tools/#kubectl) installed, you to confirm access to your **Kubernetes** cluster use the following:
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```bash
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kubectl get nodes
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```
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## Local Testing
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A Vagrantfile is provided that provision a 5 nodes cluster using LibVirt or Virtualbox and Vagrant. To use it:
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```bash
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vagrant up
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```
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By default, each node is given 2 cores and 2GB of RAM and runs Ubuntu 20.04. You can customize these settings by editing the `Vagrantfile`.
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@ -0,0 +1,56 @@
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# ENV['VAGRANT_NO_PARALLEL'] = 'no'
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NODE_ROLES = ["server-0", "server-1", "server-2", "agent-0", "agent-1"]
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NODE_BOXES = ['generic/ubuntu2004', 'generic/ubuntu2004', 'generic/ubuntu2004', 'generic/ubuntu2004', 'generic/ubuntu2004']
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NODE_CPUS = 2
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NODE_MEMORY = 2048
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# Virtualbox >= 6.1.28 require `/etc/vbox/network.conf` for expanded private networks
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NETWORK_PREFIX = "10.10.10"
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def provision(vm, role, node_num)
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vm.box = NODE_BOXES[node_num]
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vm.hostname = role
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# We use a private network because the default IPs are dynamicly assigned
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# during provisioning. This makes it impossible to know the server-0 IP when
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# provisioning subsequent servers and agents. A private network allows us to
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# assign static IPs to each node, and thus provide a known IP for the API endpoint.
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node_ip = "#{NETWORK_PREFIX}.#{100+node_num}"
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# An expanded netmask is required to allow VM<-->VM communication, virtualbox defaults to /32
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vm.network "private_network", ip: node_ip, netmask: "255.255.255.0"
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vm.provision "ansible", run: 'once' do |ansible|
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ansible.compatibility_mode = "2.0"
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ansible.playbook = "playbook/site.yml"
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ansible.groups = {
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"server" => NODE_ROLES.grep(/^server/),
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"agent" => NODE_ROLES.grep(/^agent/),
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"k3s_cluster:children" => ["server", "agent"],
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}
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ansible.extra_vars = {
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k3s_version: "v1.26.5+k3s1",
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api_endpoint: "#{NETWORK_PREFIX}.100",
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token: "myvagrant",
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# Required to use the private network configured above
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extra_server_args: "--node-external-ip #{node_ip} --flannel-iface eth1",
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extra_agent_args: "--node-external-ip #{node_ip} --flannel-iface eth1",
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}
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end
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end
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Vagrant.configure("2") do |config|
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# Default provider is libvirt, virtualbox is only provided as a backup
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config.vm.provider "libvirt" do |v|
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v.cpus = NODE_CPUS
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v.memory = NODE_MEMORY
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end
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config.vm.provider "virtualbox" do |v|
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v.cpus = NODE_CPUS
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v.memory = NODE_MEMORY
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end
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NODE_ROLES.each_with_index do |name, i|
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config.vm.define name do |node|
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provision(node.vm, name, i)
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end
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end
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end
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@ -9,14 +9,17 @@ k3s_cluster:
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192.16.35.12
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192.16.35.13
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# Required Vars
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vars:
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ansible_port: 22
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ansible_user: debian
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k3s_version: v1.25.5+k3s2
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k3s_server_location: /var/lib/rancher/k3s
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systemd_dir: /etc/systemd/system
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token: "mytoken" # Use ansible vault if you want to keep it secret
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api_endpoint: "{{ hostvars[groups['server'][0]]['ansible_host'] | default(groups['server'][0]) }}"
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api_port: 6443
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extra_server_args: ""
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extra_server_init_args: ""
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extra_agent_args: ""
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# Optional vars
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# api_port: 6443
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# k3s_server_location: /var/lib/rancher/k3s
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# systemd_dir: /etc/systemd/system
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@ -1,38 +1,17 @@
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---
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- name: Download k3s binary x64
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- name: Download k3s install script
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ansible.builtin.get_url:
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url: https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/k3s
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checksum: sha256:https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/sha256sum-amd64.txt
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url: https://get.k3s.io/
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timeout: 120
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dest: /usr/local/bin/k3s
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dest: /usr/local/bin/k3s-install.sh
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owner: root
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group: root
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mode: 0755
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when: ansible_facts.architecture == "x86_64"
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- name: Download k3s binary arm64
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ansible.builtin.get_url:
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url: https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/k3s-arm64
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checksum: sha256:https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/sha256sum-arm64.txt
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timeout: 120
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dest: /usr/local/bin/k3s
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owner: root
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group: root
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mode: 0755
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when:
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- ( ansible_facts.architecture is search("arm") and
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ansible_facts.userspace_bits == "64" ) or
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ansible_facts.architecture is search("aarch64")
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- name: Download k3s binary armhf
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ansible.builtin.get_url:
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url: https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/k3s-armhf
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checksum: sha256:https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/sha256sum-arm.txt
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timeout: 120
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dest: /usr/local/bin/k3s
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owner: root
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group: root
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mode: 0755
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when:
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- ansible_facts.architecture is search("arm")
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- ansible_facts.userspace_bits == "32"
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- name: Download k3s binary
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ansible.builtin.command:
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cmd: /usr/local/bin/k3s-install.sh
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environment:
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INSTALL_K3S_SKIP_START: "true"
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INSTALL_K3S_VERSION: "{{ k3s_version }}"
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changed_when: true
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@ -0,0 +1,4 @@
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---
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k3s_server_location: "/var/lib/rancher/k3s"
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systemd_dir: "/etc/systemd/system"
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api_port: 6443
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@ -1,4 +1,5 @@
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---
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- name: Copy K3s service file
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ansible.builtin.template:
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src: "k3s-agent.service.j2"
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@ -11,5 +12,5 @@
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ansible.builtin.systemd:
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name: k3s-agent
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daemon_reload: true
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state: restarted
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state: started
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enabled: true
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@ -1,13 +1,17 @@
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[Unit]
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Description=Lightweight Kubernetes
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Documentation=https://k3s.io
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Wants=network-online.target
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After=network-online.target
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[Install]
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WantedBy=multi-user.target
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[Service]
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Type=notify
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ExecStartPre=-/sbin/modprobe br_netfilter
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ExecStartPre=-/sbin/modprobe overlay
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ExecStart=/usr/local/bin/k3s agent --data-dir {{ k3s_server_location }} --server https://{{ api_endpoint }}:{{ api_port }} --token {{ hostvars[groups['server'][0]]['token'] }} {{ extra_agent_args }}
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EnvironmentFile=-/etc/default/%N
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EnvironmentFile=-/etc/sysconfig/%N
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EnvironmentFile=-/etc/systemd/system/k3s.service.env
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KillMode=process
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Delegate=yes
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# Having non-zero Limit*s causes performance problems due to accounting overhead
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@ -19,6 +23,7 @@ TasksMax=infinity
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TimeoutStartSec=0
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Restart=always
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RestartSec=5s
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[Install]
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WantedBy=multi-user.target
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ExecStartPre=/bin/sh -xc '! /usr/bin/systemctl is-enabled --quiet nm-cloud-setup.service'
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ExecStartPre=-/sbin/modprobe br_netfilter
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ExecStartPre=-/sbin/modprobe overlay
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ExecStart=/usr/local/bin/k3s agent --data-dir {{ k3s_server_location }} --server https://{{ api_endpoint }}:{{ api_port }} --token {{ token }} {{ extra_agent_args }}
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@ -0,0 +1,4 @@
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---
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k3s_server_location: "/var/lib/rancher/k3s"
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systemd_dir: "/etc/systemd/system"
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api_port: 6443
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@ -2,50 +2,30 @@
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- name: Init first server node
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when: ansible_hostname == groups['server'][0]
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block:
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- name: Start temporary service for HA cluster
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ansible.builtin.command:
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cmd: >
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systemd-run -p RestartSec=2 -p Restart=on-failure --unit=k3s-init k3s server
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--cluster-init --tls-san {{ api_endpoint }} --data-dir {{ k3s_server_location }} {{ extra_server_args}}
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# noqa: jinja[spacing]
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creates: "{{ k3s_server_location }}/server/node-token"
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when: groups['server'] | length > 1
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- name: Start temporary service for single server cluster
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ansible.builtin.command:
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cmd: >
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systemd-run -p RestartSec=2 -p Restart=on-failure --unit=k3s-init k3s server
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--tls-san {{ api_endpoint }} --data-dir {{ k3s_server_location }} {{ extra_server_args }}
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creates: "{{ k3s_server_location }}/server/node-token"
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- name: Copy K3s service file [Single]
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when: groups['server'] | length == 1
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ansible.builtin.template:
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src: "k3s-single.service.j2"
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dest: "{{ systemd_dir }}/k3s.service"
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owner: root
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group: root
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mode: 0644
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- name: Wait for node-token
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ansible.builtin.wait_for:
|
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path: "{{ k3s_server_location }}/server/node-token"
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- name: Copy K3s service file [HA]
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when: groups['server'] | length > 1
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ansible.builtin.template:
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src: "k3s-cluster-init.service.j2"
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||||
dest: "{{ systemd_dir }}/k3s.service"
|
||||
owner: root
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||||
group: root
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||||
mode: 0644
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|
||||
- name: Register node-token file access mode
|
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ansible.builtin.stat:
|
||||
path: "{{ k3s_server_location }}/server/node-token"
|
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register: p
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- name: Change file access node-token
|
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ansible.builtin.file:
|
||||
path: "{{ k3s_server_location }}/server/node-token"
|
||||
mode: "g+rx,o+rx"
|
||||
|
||||
- name: Read node-token from server
|
||||
ansible.builtin.slurp:
|
||||
path: "{{ k3s_server_location }}/server/node-token"
|
||||
register: node_token
|
||||
|
||||
- name: Store server node-token
|
||||
ansible.builtin.set_fact:
|
||||
token: "{{ node_token.content | b64decode | regex_replace('\n', '') }}"
|
||||
|
||||
- name: Restore node-token file access
|
||||
ansible.builtin.file:
|
||||
path: "{{ k3s_server_location }}/server/node-token"
|
||||
mode: "{{ p.stat.mode }}"
|
||||
- name: Enable and check K3s service
|
||||
ansible.builtin.systemd:
|
||||
name: k3s
|
||||
daemon_reload: true
|
||||
state: started
|
||||
enabled: true
|
||||
|
||||
- name: Create directory .kube
|
||||
ansible.builtin.file:
|
||||
|
@ -54,6 +34,10 @@
|
|||
owner: "{{ ansible_user }}"
|
||||
mode: "u=rwx,g=rx,o="
|
||||
|
||||
- name: Pause to allow server startup
|
||||
ansible.builtin.pause:
|
||||
seconds: 10
|
||||
|
||||
- name: Copy config file to user home directory
|
||||
ansible.builtin.copy:
|
||||
src: /etc/rancher/k3s/k3s.yaml
|
||||
|
@ -76,17 +60,28 @@
|
|||
flat: true
|
||||
|
||||
- name: Start other server if any and verify status
|
||||
when:
|
||||
- (groups['server'] | length) > 1
|
||||
- ansible_hostname != groups['server'][0]
|
||||
block:
|
||||
- name: Init additonal server nodes
|
||||
ansible.builtin.command:
|
||||
cmd: >
|
||||
systemd-run -p RestartSec=2 -p Restart=on-failure --unit=k3s-init k3s server
|
||||
--token "{{ hostvars[groups['server'][0]]['token'] }}" --server https://{{ api_endpoint }}:{{ api_port }}
|
||||
--tls-san {{ api_endpoint }} --data-dir {{ k3s_server_location }} {{ extra_server_args }}
|
||||
creates: "{{ k3s_server_location }}/server/node-token"
|
||||
when: ansible_hostname != groups['server'][0]
|
||||
- name: Copy K3s service file [HA]
|
||||
when: groups['server'] | length > 1
|
||||
ansible.builtin.template:
|
||||
src: "k3s-ha.service.j2"
|
||||
dest: "{{ systemd_dir }}/k3s.service"
|
||||
owner: root
|
||||
group: root
|
||||
mode: 0644
|
||||
|
||||
- name: Enable and check K3s service
|
||||
ansible.builtin.systemd:
|
||||
name: k3s
|
||||
daemon_reload: true
|
||||
state: started
|
||||
enabled: true
|
||||
|
||||
- name: Verify that all server nodes joined
|
||||
when: (groups['server'] | length) > 1
|
||||
ansible.builtin.command:
|
||||
cmd: >
|
||||
k3s kubectl get nodes -l "node-role.kubernetes.io/control-plane=true" -o=jsonpath="{.items[*].metadata.name}"
|
||||
|
@ -95,28 +90,6 @@
|
|||
retries: 20
|
||||
delay: 10
|
||||
changed_when: false
|
||||
always:
|
||||
- name: Kill the temporary init service
|
||||
ansible.builtin.systemd:
|
||||
name: k3s-init
|
||||
state: stopped
|
||||
failed_when: false
|
||||
|
||||
- name: Copy K3s service file
|
||||
ansible.builtin.template:
|
||||
src: "k3s-server.service.j2"
|
||||
dest: "{{ systemd_dir }}/k3s-server.service"
|
||||
owner: root
|
||||
group: root
|
||||
mode: 0644
|
||||
register: k3s_service
|
||||
|
||||
- name: Enable and check K3s service
|
||||
ansible.builtin.systemd:
|
||||
name: k3s-server
|
||||
daemon_reload: true
|
||||
state: restarted
|
||||
enabled: true
|
||||
|
||||
- name: Create symlinks
|
||||
ansible.builtin.file:
|
||||
|
|
|
@ -0,0 +1,28 @@
|
|||
[Unit]
|
||||
Description=Lightweight Kubernetes
|
||||
Documentation=https://k3s.io
|
||||
Wants=network-online.target
|
||||
After=network-online.target
|
||||
|
||||
[Install]
|
||||
WantedBy=multi-user.target
|
||||
|
||||
[Service]
|
||||
Type=notify
|
||||
EnvironmentFile=-/etc/default/%N
|
||||
EnvironmentFile=-/etc/sysconfig/%N
|
||||
EnvironmentFile=-/etc/systemd/system/k3s.service.env
|
||||
KillMode=process
|
||||
Delegate=yes
|
||||
# Having non-zero Limit*s causes performance problems due to accounting overhead
|
||||
# in the kernel. We recommend using cgroups to do container-local accounting.
|
||||
LimitNOFILE=1048576
|
||||
LimitNPROC=infinity
|
||||
LimitCORE=infinity
|
||||
TasksMax=infinity
|
||||
TimeoutStartSec=0
|
||||
Restart=always
|
||||
RestartSec=5s
|
||||
ExecStartPre=-/sbin/modprobe br_netfilter
|
||||
ExecStartPre=-/sbin/modprobe overlay
|
||||
ExecStart=/usr/local/bin/k3s server --cluster-init --data-dir {{ k3s_server_location }} --token {{ token }} {{ extra_server_args }}
|
|
@ -0,0 +1,28 @@
|
|||
[Unit]
|
||||
Description=Lightweight Kubernetes
|
||||
Documentation=https://k3s.io
|
||||
Wants=network-online.target
|
||||
After=network-online.target
|
||||
|
||||
[Install]
|
||||
WantedBy=multi-user.target
|
||||
|
||||
[Service]
|
||||
Type=notify
|
||||
EnvironmentFile=-/etc/default/%N
|
||||
EnvironmentFile=-/etc/sysconfig/%N
|
||||
EnvironmentFile=-/etc/systemd/system/k3s.service.env
|
||||
KillMode=process
|
||||
Delegate=yes
|
||||
# Having non-zero Limit*s causes performance problems due to accounting overhead
|
||||
# in the kernel. We recommend using cgroups to do container-local accounting.
|
||||
LimitNOFILE=1048576
|
||||
LimitNPROC=infinity
|
||||
LimitCORE=infinity
|
||||
TasksMax=infinity
|
||||
TimeoutStartSec=0
|
||||
Restart=always
|
||||
RestartSec=5s
|
||||
ExecStartPre=-/sbin/modprobe br_netfilter
|
||||
ExecStartPre=-/sbin/modprobe overlay
|
||||
ExecStart=/usr/local/bin/k3s server --data-dir {{ k3s_server_location }} --server https://{{ api_endpoint }}:{{ api_port }} --token {{ token }} {{ extra_server_args }}
|
|
@ -1,13 +1,17 @@
|
|||
[Unit]
|
||||
Description=Lightweight Kubernetes
|
||||
Documentation=https://k3s.io
|
||||
Wants=network-online.target
|
||||
After=network-online.target
|
||||
|
||||
[Install]
|
||||
WantedBy=multi-user.target
|
||||
|
||||
[Service]
|
||||
Type=notify
|
||||
ExecStartPre=-/sbin/modprobe br_netfilter
|
||||
ExecStartPre=-/sbin/modprobe overlay
|
||||
ExecStart=/usr/local/bin/k3s server --data-dir {{ k3s_server_location }} {{ extra_server_args }}
|
||||
EnvironmentFile=-/etc/default/%N
|
||||
EnvironmentFile=-/etc/sysconfig/%N
|
||||
EnvironmentFile=-/etc/systemd/system/k3s.service.env
|
||||
KillMode=process
|
||||
Delegate=yes
|
||||
# Having non-zero Limit*s causes performance problems due to accounting overhead
|
||||
|
@ -19,6 +23,6 @@ TasksMax=infinity
|
|||
TimeoutStartSec=0
|
||||
Restart=always
|
||||
RestartSec=5s
|
||||
|
||||
[Install]
|
||||
WantedBy=multi-user.target
|
||||
ExecStartPre=-/sbin/modprobe br_netfilter
|
||||
ExecStartPre=-/sbin/modprobe overlay
|
||||
ExecStart=/usr/local/bin/k3s server --data-dir {{ k3s_server_location }} --token {{ token }} {{ extra_server_args }}
|
|
@ -4,6 +4,12 @@
|
|||
state: disabled
|
||||
when: ansible_distribution in ['CentOS', 'Red Hat Enterprise Linux','RedHat']
|
||||
|
||||
- name: Install Dependent Ubuntu Packages
|
||||
when: ansible_distribution in ['Ubuntu']
|
||||
ansible.builtin.apt:
|
||||
name: policycoreutils # Used by install script to restore SELinux context
|
||||
update_cache: yes
|
||||
|
||||
- name: Enable IPv4 forwarding
|
||||
ansible.posix.sysctl:
|
||||
name: net.ipv4.ip_forward
|
||||
|
@ -53,16 +59,12 @@
|
|||
validate: 'visudo -cf %s'
|
||||
when: ansible_distribution in ['CentOS', 'Red Hat Enterprise Linux','RedHat']
|
||||
|
||||
- name: Make k3s directory
|
||||
ansible.builtin.file:
|
||||
path: "/var/lib/rancher"
|
||||
mode: 0755
|
||||
state: directory
|
||||
|
||||
- name: Create symlink
|
||||
ansible.builtin.file:
|
||||
dest: /var/lib/rancher/k3s
|
||||
src: "{{ k3s_server_location }}"
|
||||
force: true
|
||||
state: link
|
||||
when: k3s_server_location != "/var/lib/rancher/k3s"
|
||||
when:
|
||||
- k3s_server_location is defined
|
||||
- k3s_server_location != "/var/lib/rancher/k3s"
|
||||
|
|
|
@ -34,7 +34,7 @@
|
|||
ansible_facts.lsb.description|default("") is match("Debian") )
|
||||
|
||||
- name: Set detected_distribution to ArchLinux (ARM64)
|
||||
set_fact:
|
||||
ansible.builtin.set_fact:
|
||||
detected_distribution: Archlinux
|
||||
when:
|
||||
- ansible_facts.architecture is search("aarch64")
|
||||
|
|
|
@ -1,14 +1,15 @@
|
|||
---
|
||||
- name: Enable cgroup via boot commandline if not already enabled for Archlinux
|
||||
lineinfile:
|
||||
ansible.builtin.lineinfile:
|
||||
path: /boot/boot.txt
|
||||
search_string: setenv bootargs console=ttyS1,115200 console=tty0 root=PARTUUID=${uuid} rw rootwait smsc95xx.macaddr="${usbethaddr}"
|
||||
line: setenv bootargs console=ttyS1,115200 console=tty0 root=PARTUUID=${uuid} rw rootwait smsc95xx.macaddr="${usbethaddr}" cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory
|
||||
register: kernel_cmdline_cgroup
|
||||
|
||||
- name: Create
|
||||
shell: ./mkscr
|
||||
ansible.builtin.command: ./mkscr
|
||||
args:
|
||||
chdir: /boot
|
||||
notify: reboot
|
||||
when: kernel_cmdline_cgroup.changed
|
||||
changed_when: false
|
||||
when: kernel_cmdline_cgroup.changed # noqa: no-handler
|
||||
|
|
Loading…
Reference in New Issue